Anticorrosion liquid control for boiler feed-water



F. O. HUTTON Dec. 5, 1933.

ANTICORROSION LIQUID CONTROL FOR BOILER FEED WATER Filed Oct. 24, 1931 Patented Dec. 5, 1933 UNlTED STATES ANTICORROSION LIQUID CONTROL FOR BOILER FEED-WATER Frank 0. Hutton, Sacramento, Calif.

Application October 24, 1931. Serial No. 570,871

2 Claims.

This invention relates to steam boilers etc. and particularly to a means for feeding anti-corrosive acid or other liquid to the boiler so as to prevent corrosion andpitting of the metal of the boiler in ii contact with the water as well as for cutting scale etc., depending on the character of liquid used.

The principal object of my invention is to provide an apparatus for the purpose by means of which a quantity of liquid from a main supply tank is automatically taken into the boiler along with the water fed to the boiler through the feed pipe, and in an amount proportionate to and governed by the volume of water flowing through 15 said pipe.

The apparatus is also arranged so that the liquid is thoroughly mixed with the water before the latter enters the boiler, so that said liquid is discharged into the boiler in a non-concentrated .20 form and becomes quickly and widely distributed over the boiler area.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

. These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawing similar characters of reference indicate corresponding parts in the several views:

Fig. l is a side elevation of the complete apparatus.

Fig. 2 is a sectional elevation of the liquidflow control valve unit detached.

Referring now more particularly to the characters of reference on the drawing, the numeral 1 denotes a tank of suitable capacity for a supply of anti-corrosive or other liquid, while 2 denotes the water feed pipe leading to the boiler and disposed below the tank.

Interposed, in the pipe 2 directly under the tank is a check valve opening toward the boiler and comprising a body 3 having a vertically movable and self-seating valve 4 mounted therein.

The valve is normally closed and is raised and opened by the pressure of the water passing to the boiler, and the greater the flow or volume of water the greater will be the raising movement of the valve.

Secured at the top of the body in central 'alinement with the valve is a nipple 5, formed intermediate its ends with a seat 6 for a ball '7 or similar valve which closes downwardly of its own weight. 7 A rod 8 engages the bottom of the ball and is supported at its lower end in a recess 9 formed in the upper surface of the valve 4. The upper portion of the rod is guided against excessive tilting by the walls of the passage 10 leading to the bottom of the nipple from the ,5? seat 6. An ordinary globe or similar valve 11 is connected to and projects upwardly from the nipple and is also connected to the bottom of the tank.

It will therefore be seen that with any flow of water through the pipe 2 the valve 4 will be lifted. This movement is transmitted through the rod 10 to also lift the ball valve 7 from its seat to an amount corresponding to the lift of the valve 4. The liquid from the tank 1 there- :79 fore flows down into the valve body and immediately mixes with the water flowing therethrough to the boiler. The walls of the passage bore in the nipple above the seat 6 diverge upwardly as shown in Fig. 2, so that said bore is of 5 increasingly large diameter relative to the valve 7. In this manner the volume of liquid passing by the valve when it is opened and raised is governed by and is in proportion to the extent of raising, which in turn is determined by the extent 8J1 of raising of the check valve 4.

To enable the liquid to thus fiow against the pressure of water an equalizing pipe 12 is connected to the top of the tank and to the pipe 2 beyond the valve 3 with a shut-off valve 13 therein. If my device is used in connection with the storage pressure tank of a hot-water heating system, a bypass 14 must be provided around the valve 3, having a standard check valve 15 thereon opening away from the tank. 129 i It is necessary in such installations, since pressure tanks in heating systems have no relief valves of their own, and pressure caused by the heating and expansion of the water must back up through the feed pipe. Without the bypass 9? the back pressure could not of course get past the closed check valve. Any such back-pressure water entering the body 3 above the valve and tending to lift the ball valve, is counteracted by 100 the corresponding pressure in the pipe 12 and on top of the liquid in the tank.

From the foregoing description it will be read ily seen that I have produced such a device as substantially fulfills the objects of the invention v.195 as set forth herein. While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a de- 1,10

parture from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. In combination, a feed-water pipe, an anticorrosive liquid tank, a passage between the tank and pipe, said passage having a valve-seat formed therein, an upwardly opening valve normally engaging the seat, and means actuated by a flow of water through the pipe to open said valve; the valve seat in the passage being disposed intermediate the ends of the same, and the walls of the passage bore above the seat diverging upwardly whereby the amount of liquid passing by the corresponding valve when raised and opened will be proportionate to the extent of raising movement.

2. In combination, a feed-water pipe, an anticorrosive liquid tank, a passage between the tank and pipe, a normally closed valve in the passage, means to open the valve by a flow of water through the pipe in one direction, a bypass connected to the feed pipe on opposite sides of the passage, and a check valve in said bypass opening in the direction opposite to the normal direction of flow of the water through the pipe.

FRANK O. HUTTON. 

